windows 7 virtual pc fails (dddgraphics - vmware wins

windows 7 virtual pc shows weird lines on the screen then crashes when i try to install ubuntu. when i try to install cent os 5 the and the text is barely readable and stretched out with many black lines going through it.  i've discerned it to be a problem with virtual pc.  i tried using vmware's viewer and i didn't have any trouble. download here: http://www.vmware.com/products/player/.